« Previous AbstractInvestigation of the dynamic changes in the chemical constituents of Chinese 'Laba' garlic during traditional processing    Next AbstractEmission of volatile organic compounds from a small-scale municipal solid waste transfer station: Ozone-formation potential and health risk assessment »

Molecules

Title:		Effects of Melatonin Treatment of Postharvest Pear Fruit on Aromatic Volatile Biosynthesis
Author(s):		Liu J; Liu H; Wu T; Zhai R; Yang C; Wang Z; Ma F; Xu L;
Address:		"College of Horticulture, Qingdao Agricultural University, Changcheng Road No.700, Qingdao 266109, Shandong Province, China. College of Horticulture, Northwest A&F University, Taicheng Road NO.3, Yangling 712100, Shaanxi Province, China"
Journal Title:		Molecules
Year:		2019
Volume:		20191121
Issue:		23
Page Number:		-
DOI:		10.3390/molecules24234233
ISSN/ISBN:		1420-3049 (Electronic) 1420-3049 (Linking)
Abstract:		"Aroma affects the sensory quality of fruit and, consequently, consumer satisfaction. Melatonin (MT) is a plant growth regulator used to delay senescence in postharvest fruit during storage; however, its effect on aroma of pear fruit remains unclear. In this study, we assessed the effects of 0.1 mmol L(-1) MT on volatiles and associated gene expression in the fruit of pear cultivars 'Korla' (Pyrus brestschneideri Rehd) and 'Abbe Fetel' (Pyrus communis L.). MT mainly affected the production of C(6) aromatic substances in the two varieties. In 'Korla', MT inhibited expression of PbHPL, and reduced hydroperoxide lyase (HPL) activity and content of hexanal and (E)-hex-2-enal. In contrast, MT inhibited activity of lipoxygenase (LOX), reduced expression of PbLOX1 and PbLOX2, promoted PbAAT gene expression, increased alcohol acyltransferase (AAT) activity, and increased propyl acetate, and hexyl acetate content in 'Abbe Fetel' that similarly led to the reduction in content of hexanal and (E)-hex-2-enal. Content of esters in 'Abbe Fetel' pear increased with increasing postharvest storage period. Although mechanisms differed between the two varieties, effects on aroma volatiles mediated by MT were driven by expression of genes encoding LOX, HPL, and AAT enzymes"
Keywords:		Antioxidants/*pharmacology Esters/metabolism Ethylenes/metabolism Fruit/drug effects/growth & development/*metabolism Lipoxygenase/genetics/metabolism Melatonin/*pharmacology Odorants/*analysis Plant Proteins/genetics/*metabolism Pyrus/drug effects/growth;
Notes:		"MedlineLiu, Jianlong Liu, Hanting Wu, Ting Zhai, Rui Yang, Chengquan Wang, Zhigang Ma, Fengwang Xu, Lingfei eng CARS-28-45/Agriculture Research System of China/ Switzerland 2019/11/27 Molecules. 2019 Nov 21; 24(23):4233. doi: 10.3390/molecules24234233"